Hi Dylan - I have a guhong v2, as will as a zhanchi.
I'd say the guhong is definitely more controllable, my f2l it's faster, but my LL really suffers with the guhong... The zhanchi is faster and less controllable... It's a matter of personal preference, my times are similar with both.
Maybe tightening your zhanchi, or using a heavier/more viscous lube would help? I found mine hard to control at first, as I was used to the guhong, but I've worked on my turning accuracy and wouldn't go back now!